Single-crystal piezoelectric fiber composite and magnetoelectric laminate composite including the same

Abstract

A piezoelectric fiber composite and a magnetoelectric laminate composite including the same are disclosed. The piezoelectric fiber composite includes a first protective layer having a first electrode, a second protective layer having a second electrode, and a piezoelectric fiber layer formed between the first and the second electrode and having piezoelectric fibers arranged in the longitudinal direction of the composite, wherein the piezoelectric fibers include a single-crystal piezoelectric material and are configured such that a <011> direction of the single crystal is identical to a thickness direction of the composite and a <001> direction of the single crystal is identical to a longitudinal direction of the composite, thus exhibiting superior piezoelectric strain properties and sensing properties. Also, the magnetoelectric laminate composite includes the piezoelectric fiber composite and a magnetostrictive layer including a magnetostrictive material such as nickel (Ni) or Metglas (FeBSi alloy), thus ensuring significantly improved magnetoelectric properties.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority to Korean Patent Application No. 10-2014-0010569 filed on Jan. 28, 2014 and all the benefits accruing therefrom under 35 U.S.C. §119, the contents of which are incorporated by reference in their entirety.BACKGROUND OF THE INVENTION [0002]1. Field of the Invention[0003]The present invention relates to a piezoelectric fiber composite, a preparation method thereof, a magnetoelectric laminate composite including the piezoelectric fiber composite, a manufacturing method thereof and a piezoelectric device including the piezoelectric fiber composite or the magnetoelectric laminate composite. More particularly, the present invention relates to a single-crystal piezoelectric fiber composite containing single-crystal piezoelectric fibers oriented in a specific direction, a preparation method thereof, a magnetoelectric laminate composite including the piezoelectric fiber composite, a manufacturing method thereof, and ...

AI Technical Summary

Benefits of technology

The present invention provides a piezoelectric fiber composite and a preparation method, and a magnetoelectric laminate composite and a manufacturing method. The piezoelectric fiber composite includes piezoelectric fibers composed of a single crystal having a specific crystallographic direction oriented in a poling direction to maximize piezoelectric effects. The magnetoelectric laminate composite includes the piezoelectric fiber composite and a magnetostrictive layer on one or both sides of the composite to achieve greatly improved magnetoelectric effects due to interactions with the composite. The piezoelectric fiber composite and the magnetoelectric laminate composite can be used as sensors, actuators, and energy harvesting devices for mechanical vibration energy. The magnetoelectric laminate composite can provide significantly improved magnetoelectric properties compared to existing composites and can show excellent performance in energy harvesting devices in response to external stimulation including changes in mechanical vibration and / or magnetic field. The invention can be used as an energy harvesting device for power-line monitoring sensor driving power source, which can supply power to the sensor for a continuous and stable operation without the need for periodic replacement of a power supply. This increases the lifecycle of the sensor node and the reliability of data to be sensed, accelerating the commercialization of USN-based systems such as power-line remote monitoring systems.

Problems solved by technology

However, most piezoelectric materials are ceramic materials, and thus limitations are imposed on application into various shapes and usages thereof due to the intrinsic brittleness of ceramic materials.

However, since a piezoelectric fiber composite such as MFC includes the polymer matrix between electrodes and piezoelectric fibers, it is difficult to predict and design the control and operation of devices; furthermore, high driving voltage is required to operate the device including such a composite, which is very undesirable.

Moreover, a piezoelectric fiber composite such as MFC is problematic because it is impossible to maximize piezoelectric properties that vary depending on the crystal orientation of the piezoelectric material, due to the use of ceramic piezoelectric fiber materials.

Images